Dental impression tray



V. M. ROBINSON.

DENTAL IMPRESSION TRAY.

APPLICATION FILED JULY 11, 1921.

1,40 ,492, Patented Feb. 14 19 22.

. INVENTOI? WITNESSES 28 V MRo'b'mso'n,

A TTORNEYS unrrlazn ST'A'ILES PATENT OFFICE.

VINCENT MUNGER ROBINSON, OF ST; JOSEPH, MISSOURI.

DENTAL IMPRESSION TRAY.

Application filed July 11, 1921. Serial No. 483,896.

To all whom it may concern Be it known that I, VINCENT MUNGER ROBINSON,a citizen of the United States, and a resident of St. Joseph, in thecounty of Buchanan and State of Missouri, have instruction, adaptable tothe varied requirements of individual cases, which may be advantageously employed in obtaining impressions in difficult caseswherein the tooth is undercut or has a bulbous crown, and which in allcases is effective to secure a distinct, clean-cut and true impression.v

Other objects and advantages of the invention reside in certain novelfeatures of construction, combination and. arrangement of parts whichwill be hereinafter more fully described and particularly pointed out inthe appended claims, reference being had to the accompanying drawingsforming part of this specification, and in which:

Figure 1 is a group view in perspective of an embodiment of theinvention;

Figure 2 is a perspective view, illustrating the invention in assemblyand showing one form of division plate;

Figure 3 is a View in transverse vertical section of the assembly shownin Figure 1;

Figure 4 is a detail view in elevation of a modified form of divisionplate;

Figure 5 is a similar view of another modified form of division plate;and

Figure 6 is a similar view of still another modified form of divisionplate.

Referring to the drawings wherein for the sake of illustration is shownthe preferred embodiment of the invention, the numeral-1 10 designates ablank of metal, such as alu minum or the like. The blank is bent to forma dental impression tray having a bottom 11 and side walls 12, the sidewalls having tongues 13 extending therefrom at each end thereof whichtongues are preferably tapered slightly toward the outer ends. Thebottom, side walls and tongues thus constitute a tray or containerconstructed of a single piece of resilient metal with the tongues 13extending from the tray in such manner that they may be bent in or outas the case may be to act as guides causing the tray to be centered orplaced in its proper position in relation to the teeth.

The blank in the portion thereof which forms the bottom wall 11 of thetray is provided with an elongated slot 15 which preferably extendslongitudinally of the bottom and parallel to the base. The slot 15 isadapted to receive the tongue or other cooperative connective meanscarried by a division plate now to be described.

In the form of the invention shown in Figures 1 to 3 the division platecomprises a rectangular piece or body portion 17 constructed of suitablematerial and having a tongue 18 extending from its lower side and in theplane of the body portion. The tongue 18 is of a longitudinal extentless than that of the body portion whereby the body portion presentsshoulders 17 which abut the bottom wall of the tray in assembly, thetongue 18 entering the slot 15 of the bottom.

In Figure 4 the division plate includes a body portion 19 having aU-shaped opening 20 provided therein and having a tongue 21 adapted toenter the slot in the bottom of the container. In Figure 5 the bodyportion of the division plate is designated at 22 and the tongue at23,the body portion being cut away on a curved line 24. In Figure 6, thebody portion 25 is cut away on curved lines 26 and 27, the tongue beingdesignated at 28. All of the division plates when assembled with thetray have their tongues received in the slot of the bottom wall. Thedivision plates are cut away to adapt them to individual cases and areso placed as to facilitate the splitting of the impression materialthrough its long axis thus enabling an impression to be taken ofdifferent cases having an undercut or of a tooth having a bulbous crown.

I claim:

1. A dental impression tray constructed of a single blank of resilientmetal bent to form thereof and adapted to be bent to center the.

tray, the bottom wall having an elongated slot therein and it divisionplate having a tongne adapted to enter said slot.

2. A dental impression tray constructed of a single blank o1 resilientInetzil bent to form a bottom and side Walls, the side Walls han ingtongues extending from the ends thereof and adapted to be bent to centerthe tray.

3. A dental impression tray having it slot in one of its Walls anddivision plates having a tongue adapted to enter said slot.

4. In combination, a dental impression tray, division plates havingaeontour corresponding to the impression to he taken, and means forreleasably maintaining the clivision plate in position in the tray. i

VINCENT MUN GER ROBINSON.

